Programs include class and method definitions.

程序包含类和方法的定义。

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In fact, method definitions — def — are no more than Ruby macros.

事实上，方法定义——def——仅仅是Ruby的宏。

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Method definitions can also be nested.

方法定义也可以被嵌套。

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Method definitions start with the def keyword.

方法定义由def关键字开始。

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Method definitions start with the def keyword.

方法定义由def关键字开始。

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